Seeded emulsion polymerization of vinyl acetate

The study of seeded emulsion polymerization of vinyl acetate in the absence of emulsifiers, with potassium persulfate as an initiator has been conducted in order to investigate the kinetics and mechanism of particle nucleation. Poly(vinyl acetate) latex particles are stabilized by the ionic end groups from decomposition of initiator. The polymerization behaviour of vinyl acetate in the water phase has been clarified. The variation of the polymerization rate with changes in initiator concentration, monomer-polymer ratio, and stirring speed were determined. The polymerization rate of seeded emulsion polymerization of vinyl acetate is dependent on the initiator concentration to the 0.60 ± 0.05 power, however, it is independent of the monomer-polymer ratio. There was no significant change in polymerization rate when the stirring rate was changed from 50 to 150 rpm, but, the polymerization rate was considerably reduced when the stirring rate was increased to 300 rpm. New small particles were formed in the system where the monomer-polymer ratio was substantial large (that is the system containing a small amount of seed particles). The emulsifier-free emulsion polymerization of vinyl acetate in the absence of seed particles was also investigated. It was found that the polymerization rate is proportional to the 0.69 power of initial monomer concentration

Implementation and Reconfiguration of Robot Operating System on Human Follower Transporter Robot

Robotic Operation System (ROS) is an im- portant platform to develop robot applications. One area of applications is for development of a Human Follower Transporter Robot (HFTR), which can be considered as a custom mobile robot utilizing differential driver steering method and equipped with Kinect sensor. This study discusses the development of the robot navigation system by implementing Simultaneous Localization and Mapping (SLAM)

A makro-TSH diagnosztikus és terápiás jelentősége Hashimoto-thyreoiditises betegekben | Diagnostic and therapeutical significance of macro-TSH in patients with Hashimoto’s thyroiditis

Absztrakt: Bevezetés: A makro-TSH szerkezete, incidenciája és klinikai szerepe pajzsmirigybetegekben nem tisztázott. Célkitűzés: A makro-TSH előfordulási gyakoriságának, tulajdonságainak meghatározása Hashimoto-thyreoiditises betegek savójában. Módszer: A Hashimoto-thyreoiditises betegek vérmintáiban a makro-TSH-t meghatározták polietilén-glikol precipitációs módszerrel és protein G agaróz abszorpciós, illetve gélfiltrációs kromatográfiával. A makro-TSH biológiai aktivitását TSH-receptorral transzfektált CHO bioassay módszerével mérték. A betegek L-tiroxin-kezelésben részesültek (átlagosan 66,5 µg/nap), a betegek fele pedig szelént is kapott (átlagosan 60 µg/nap). Eredmények: 880 Hashimoto-thyreoiditises beteget (728 nő, átlagéletkor 44,8 év) vontak be a vizsgálatba. A makro-TSH-t 41 betegben (4,6%) mutatták ki, az átlagos TSH-szint a PEG-precipitáció előtt 185,4 ± 35 IU/l volt, a precipitáció után pedig 5,55 ± 1,8 IU/l. Az anti-TPO-szint 445 ± 51 IU/l volt és fokozatosan csökkent 212 ± 51 IU/l-re egyéves tiroxin- és szelénkezelés után. Mind a PEG-precipitációs, mind a protein G abszorpciós módszerrel, illetve gélkromatográfiás eljárással a TSH elleni antitest jelenlétét mutatták ki a makro-TSH-immunkomplexben. A makro-TSH biológialag inaktívnak bizonyult, mivel a CHO-sejteket nem stimulálta. A makro-TSH a szelénnel nem kezelt csoportban 18 ± 3,2 hónapig, a szelénnel kezeltben 12 ± 1,9 hónapig volt kimutatható. Következtetés: A TSH elleni antitestek fő komponensei a makro-TSH-nak és diagnosztikus, illetve terápiás nehézségeket okozhatnak. A PEG-precipitációs eljárás alkalmas szűrőmódszer a makro-TSH bizonyítására. A szelén képes nemcsak az anti-TPO-, hanem a makro-TSH-szint csökkentésére egyaránt. Amikor a TSH-szint 40,0 IU/l feletti a hypothyreosis jelei nélkül, gondolnunk kell a makro-TSH jelenlétére. Orv Hetil. 2017; 158(34): 1346–1350. | Abstract: Introduction: Structure, importance and incidence and clinical role of macro-TSH not clarified in thyroid diseases. Aim: This study was undertaken to determine the incidence and biological role of macro-TSH in patients with Hashimoto’s thyroiditis. Method: Blood samples taken from patients with Hashimoto’s thyroiditis were screened for the presence of macro-TSH with the polyethylene glycol method and confirmed with protein G agarose absorption test and gel filtration chromatography. Stimulatory capacity of macro-TSH was measured by CHO cells bio-assay. Patients were treated with L-thyroxine (mean 66.5 µg/day) and half of them with selenium (mean 60 µg/day), respectively. Results: 880 patients (728 female, aged 44.8 yr) with Hashimoto’s thyroiditis was involved in the study. Macro-TSH was found in the serum of 41 patients (4.6%), the mean TSH 185.4 ± 35 IU/l was before PEG precipitations and after 5.55 ± 1.8 IU/l. Titre of anti-TPO proved to be 445 ± 51 IU/l and gradulally decreased to 212 ± 51 IU/l after one year therapy. Both the precipitation, protein G absorption and gel chromatography supported the presence of anti-TSH antibody in the macro-TSH complex. Stimulatory capacity of macro-TSH on CHO bio-assay was not proved. The macro-TSH was detected in the selenium not treated group for 18 ± 3.2 months, selenium-treated for 12 ± 1.9 months. Conclusion: It is concluded that anti-human TSH autoantibodies are a major components of macro-TSH and may cause diagnostic and therapeutical difficulties. The PEG precipitation is a suitable screening method for detection of macro-TSH. Selenium is able to decrease of anti-TPO antibodies and macro-TSH, respectively. When the TSH level is greater than 40.0 IU/l, without the signs of hypothyroidism, the presence of macro-TSH is to be considered. Orv Hetil. 2017; 158(34): 1346–1350

Translating Elizabeth Gaskell's "Right at Last" with an Eye on Italian Translations of Gaskell's Works: Problems and Strategies

Table S1. numerical indices of physicochemical and biochemical properties of amino acids. (XLSX 11 kb

第915回千葉医学会例会・第12回千葉精神科集談会

SNP-array data of Patient 1. (XLSX 13 kb

Práticas de literacia familiar em benguela (angola): Um estudo exploratório.

As investigações mostram que a aprendizagem da linguagem escrita começa muito antes do ensino formal e que as práticas e o ambiente de literacia familiar influenciam a literacia emergente e o desenvolvimento da linguagem escrita. Mas, se estes estudos são desenvolvidos no Ocidente, em África pouco se tem feito e em Angola não se conhece nenhum estudo. Com base nos estudos existentes, em diversos contextos culturais, verifica-se que a literacia familiar existe, podendo as práticas variar no tipo e frequência uma vez que o que se passa num contexto, pode não ser igual ao que se passa noutra realidade cultural diferente. Neste sentido este trabalho, procura caraterizar as práticas e o ambiente familiar de literacia em 11 famílias de Benguela com um filho a frequentar o início da escolaridade. Os dados foram recolhidos através de uma entrevista informal aos pais. Os resultados mostram que as práticas de literacia familiar são essencialmente práticas formais, muito ligadas à escola e às tarefas escolares. No mesmo sentido verificámos que a responsabilidade pela aprendizagem da linguagem escrita é atribuída à escola, e a explicadores. Apesar de surgirem algumas referências do uso da literacia associado a práticas religiosas, poucas referências foram feitas a práticas informais ou lúdicas. Foi clara a quase inexistência de materiais de leitura (jornais, livros, revistas) para além dos escolares. A falta de tempo, a escassez de bibliotecas públicas e livrarias, a falta dos recursos financeiras para aquisição do material de literacia e a iliteracia foram apontados como obstáculos para o desenvolvimento de outro tipo de práticasinfo:eu-repo/semantics/publishedVersio

Visualization 1.avi

The experimental results for the remaining thirty-two locations are shown in Visualization 1, where the maximum PV value of the error after correction is 0.1644 mm, indicating satisfactory improvement is achieved by the neural network

Dataset1.zip

Additional projected images from simulations and experiment

Additional file 3 of Chinese residents’ knowledge about and behavior towards dairy products: a cross-sectional study

Additional file 3: Table S3. Diary purchasing behavior of Chinese residents

Total Synthesis of Purported Cephalosporolides H and I, Penisporolide B, and Their Stereoisomers

Development of a unified, bioinspired synthetic strategy to access four possible diastereomers of unique 2,2-dimethyl-[5,5]-spiroacetal-cis-fused-γ-lactone (Me2SAFL) is reported, featuring pyridinium chlorochromate (PCC)-promoted oxidative ring expansion of β-hydroxy cyclic ethers and dehydrative ring-contraction rearrangement of 10-membered lactones. Synthetic utility of this strategy was demonstrated by total syntheses of 12 Me2SAFLs, corresponding to the purported cephalosporolide H (CesH), cephalosporolide I (CesI), and penisporolide B (PenB) and their possible diastereomers. Comprehensive NMR data analysis suggested that the tricyclic Me2SAFL core of CesH, CesI, and PenB should be revised to the same relative (3R*, 4R*, 6S*, 9R*) configuration and that the side chains required an unknown constitutional structure revision